/**********************************************************************
 * 
 * StackWalker.cpp
 *
 *
 * History:
 *  2005-07-27   v1	- First public release on http://www.codeproject.com/
 *					   http://www.codeproject.com/threads/StackWalker.asp
 *  2005-07-28   v2	- Changed the params of the constructor and ShowCallstack
 *					   (to simplify the usage)
 *  2005-08-01   v3	- Changed to use 'CONTEXT_FULL' instead of CONTEXT_ALL 
 *					   (should also be enough)
 *					 - Changed to compile correctly with the PSDK of VC7.0
 *					   (GetFileVersionInfoSizeA and GetFileVersionInfoA is wrongly defined:
 *						it uses LPSTR instead of LPCSTR as first paremeter)
 *					 - Added declarations to support VC5/6 without using 'dbghelp.h'
 *					 - Added a 'pUserData' member to the ShowCallstack function and the 
 *					   PReadProcessMemoryRoutine declaration (to pass some user-defined data, 
 *					   which can be used in the readMemoryFunction-callback)
 *  2005-08-02   v4	- OnSymInit now also outputs the OS-Version by default
 *					 - Added example for doing an exception-callstack-walking in main.cpp
 *					   (thanks to owillebo: http://www.codeproject.com/script/profile/whos_who.asp?id=536268)
 *  2005-08-05   v5	- Removed most Lint (http://www.gimpel.com/) errors... thanks to Okko Willeboordse!
 *
 **********************************************************************/
#define NOMINMAX

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#pragma comment(lib, "version.lib")  // for "VerQueryValue"

#include "StackWalker.h"


// If VC7 and later, then use the shipped 'dbghelp.h'-file
#if _MSC_VER >= 1300
#include <dbghelp.h>
#else
// ARCEMU_INLINE the important dbghelp.h-declarations...
typedef enum {
	SymNone = 0,
	SymCoff,
	SymCv,
	SymPdb,
	SymExport,
	SymDeferred,
	SymSym,
	SymDia,
	SymVirtual,
	NumSymTypes
} SYM_TYPE;
typedef struct _IMAGEHLP_LINE64 {
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_LINE64)
	PVOID					   Key;					// internal
	DWORD					   LineNumber;			 // line number in file
	PCHAR					   FileName;			   // full filename
	DWORD64					 Address;				// first instruction of line
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef struct _IMAGEHLP_MODULE64 {
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
	DWORD64					 BaseOfImage;			// base load address of module
	DWORD					   ImageSize;			  // virtual size of the loaded module
	DWORD					   TimeDateStamp;		  // date/time stamp from pe header
	DWORD					   CheckSum;			   // checksum from the pe header
	DWORD					   NumSyms;				// number of symbols in the symbol table
	SYM_TYPE					SymType;				// type of symbols loaded
	CHAR						ModuleName[32];		 // module name
	CHAR						ImageName[256];		 // image name
	CHAR						LoadedImageName[256];   // symbol file name
} IMAGEHLP_MODULE64, *PIMAGEHLP_MODULE64;
typedef struct _IMAGEHLP_SYMBOL64 {
	DWORD					   SizeOfStruct;		   // set to sizeof(IMAGEHLP_SYMBOL64)
	DWORD64					 Address;				// virtual address including dll base address
	DWORD					   Size;				   // estimated size of symbol, can be zero
	DWORD					   Flags;				  // info about the symbols, see the SYMF defines
	DWORD					   MaxNameLength;		  // maximum size of symbol name in 'Name'
	CHAR						Name[1];				// symbol name (null terminated string)
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef enum {
	AddrMode1616,
	AddrMode1632,
	AddrModeReal,
	AddrModeFlat
} ADDRESS_MODE;
typedef struct _tagADDRESS64 {
	DWORD64	   Offset;
	WORD		  Segment;
	ADDRESS_MODE  Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _KDHELP64 {
	DWORD64   Thread;
	DWORD   ThCallbackStack;
	DWORD   ThCallbackBStore;
	DWORD   NextCallback;
	DWORD   FramePointer;
	DWORD64   KiCallUserMode;
	DWORD64   KeUserCallbackDispatcher;
	DWORD64   SystemRangeStart;
	DWORD64  Reserved[8];
} KDHELP64, *PKDHELP64;
typedef struct _tagSTACKFRAME64 {
	ADDRESS64   AddrPC;			   // program counter
	ADDRESS64   AddrReturn;		   // return address
	ADDRESS64   AddrFrame;			// frame pointer
	ADDRESS64   AddrStack;			// stack pointer
	ADDRESS64   AddrBStore;		   // backing store pointer
	PVOID	   FuncTableEntry;	   // pointer to pdata/fpo or NULL
	DWORD64	 Params[4];			// possible arguments to the function
	BOOL		Far;				  // WOW far call
	BOOL		Virtual;			  // is this a virtual frame?
	DWORD64	 Reserved[3];
	KDHELP64	KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
typedef
BOOL
(__stdcall *PREAD_PROCESS_MEMORY_ROUTINE64)(
	HANDLE	  hProcess,
	DWORD64	 qwBaseAddress,
	PVOID	   lpBuffer,
	DWORD	   nSize,
	LPDWORD	 lpNumberOfBytesRead
	);
typedef
PVOID
(__stdcall *PFUNCTION_TABLE_ACCESS_ROUTINE64)(
	HANDLE  hProcess,
	DWORD64 AddrBase
	);
typedef
DWORD64
(__stdcall *PGET_MODULE_BASE_ROUTINE64)(
	HANDLE  hProcess,
	DWORD64 Address
	);
typedef
DWORD64
(__stdcall *PTRANSLATE_ADDRESS_ROUTINE64)(
	HANDLE	hProcess,
	HANDLE	hThread,
	LPADDRESS64 lpaddr
	);
#define SYMOPT_CASE_INSENSITIVE		 0x00000001
#define SYMOPT_UNDNAME				  0x00000002
#define SYMOPT_DEFERRED_LOADS		   0x00000004
#define SYMOPT_NO_CPP				   0x00000008
#define SYMOPT_LOAD_LINES			   0x00000010
#define SYMOPT_OMAP_FIND_NEAREST		0x00000020
#define SYMOPT_LOAD_ANYTHING			0x00000040
#define SYMOPT_IGNORE_CVREC			 0x00000080
#define SYMOPT_NO_UNQUALIFIED_LOADS	 0x00000100
#define SYMOPT_FAIL_CRITICAL_ERRORS	 0x00000200
#define SYMOPT_EXACT_SYMBOLS			0x00000400
#define SYMOPT_ALLOW_ABSOLUTE_SYMBOLS   0x00000800
#define SYMOPT_IGNORE_NT_SYMPATH		0x00001000
#define SYMOPT_INCLUDE_32BIT_MODULES	0x00002000
#define SYMOPT_PUBLICS_ONLY			 0x00004000
#define SYMOPT_NO_PUBLICS			   0x00008000
#define SYMOPT_AUTO_PUBLICS			 0x00010000
#define SYMOPT_NO_IMAGE_SEARCH		  0x00020000
#define SYMOPT_SECURE				   0x00040000
#define SYMOPT_DEBUG					0x80000000
#define UNDNAME_COMPLETE				 (0x0000)  // Enable full undecoration
#define UNDNAME_NAME_ONLY				(0x1000)  // Crack only the name for primary declaration;
#endif  // _MSC_VER < 1300

// Some missing defines (for VC5/6):
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif  


// secure-CRT_functions are only available starting with VC8
#if _MSC_VER < 1400
#define strcpy_s strcpy
#define strcat_s(dst, len, src) strcat(dst, src)
#define _snprintf_s _snprintf
#define _tcscat_s _tcscat
#endif

// Normally it should be enough to use 'CONTEXT_FULL' (better would be 'CONTEXT_ALL')
#define USED_CONTEXT_FLAGS CONTEXT_FULL


class __declspec(dllexport) StackWalkerInternal
{
public:
  StackWalkerInternal(StackWalker *parent, HANDLE hProcess)
  {
	m_parent = parent;
	m_hDbhHelp = NULL;
	pSC = NULL;
	m_hProcess = hProcess;
	m_szSymPath = NULL;
	pSFTA = NULL;
	pSGLFA = NULL;
	pSGMB = NULL;
	pSGMI = NULL;
	pSGO = NULL;
	pSGSFA = NULL;
	pSI = NULL;
	pSLM = NULL;
	pSSO = NULL;
	pSW = NULL;
	pUDSN = NULL;
	pSGSP = NULL;
  }
  ~StackWalkerInternal()
  {
	if (pSC != NULL)
	  pSC(m_hProcess);  // SymCleanup
	if (m_hDbhHelp != NULL)
	  FreeLibrary(m_hDbhHelp);
	m_hDbhHelp = NULL;
	m_parent = NULL;
	if(m_szSymPath != NULL)
	  free(m_szSymPath);
	m_szSymPath = NULL;
  }
  BOOL Init(LPCSTR szSymPath)
  {
	if (m_parent == NULL)
	  return FALSE;
	// Dynamically load the Entry-Points for dbghelp.dll:
	// First try to load the newsest one from
	TCHAR szTemp[4096];
	// But before wqe do this, we first check if the ".local" file exists
	if (GetModuleFileName(NULL, szTemp, 4096) > 0)
	{
	  _tcscat_s(szTemp, _T(".local"));
	  if (GetFileAttributes(szTemp) == INVALID_FILE_ATTRIBUTES)
	  {
		// ".local" file does not exist, so we can try to load the dbghelp.dll from the "Debugging Tools for Windows"
		if (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0)
		{
		  _tcscat_s(szTemp, _T("\\Debugging Tools for Windows\\dbghelp.dll"));
		  // now check if the file exists:
		  if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
		  {
			m_hDbhHelp = LoadLibrary(szTemp);
		  }
		}
		  // Still not found? Then try to load the 64-Bit version:
		if ( (m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0) )
		{
		  _tcscat_s(szTemp, _T("\\Debugging Tools for Windows 64-Bit\\dbghelp.dll"));
		  if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
		  {
			m_hDbhHelp = LoadLibrary(szTemp);
		  }
		}
	  }
	}
	if (m_hDbhHelp == NULL)  // if not already loaded, try to load a default-one
	  m_hDbhHelp = LoadLibrary( _T("dbghelp.dll") );
	if (m_hDbhHelp == NULL)
	  return FALSE;
	pSI = (tSI) GetProcAddress(m_hDbhHelp, "SymInitialize" );
	pSC = (tSC) GetProcAddress(m_hDbhHelp, "SymCleanup" );

	pSW = (tSW) GetProcAddress(m_hDbhHelp, "StackWalk64" );
	pSGO = (tSGO) GetProcAddress(m_hDbhHelp, "SymGetOptions" );
	pSSO = (tSSO) GetProcAddress(m_hDbhHelp, "SymSetOptions" );

	pSFTA = (tSFTA) GetProcAddress(m_hDbhHelp, "SymFunctionTableAccess64" );
	pSGLFA = (tSGLFA) GetProcAddress(m_hDbhHelp, "SymGetLineFromAddr64" );
	pSGMB = (tSGMB) GetProcAddress(m_hDbhHelp, "SymGetModuleBase64" );
	pSGMI = (tSGMI) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64" );
	//pSGMI_V3 = (tSGMI_V3) GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64" );
	pSGSFA = (tSGSFA) GetProcAddress(m_hDbhHelp, "SymGetSymFromAddr64" );
	pUDSN = (tUDSN) GetProcAddress(m_hDbhHelp, "UnDecorateSymbolName" );
	pSLM = (tSLM) GetProcAddress(m_hDbhHelp, "SymLoadModule64" );
	pSGSP =(tSGSP) GetProcAddress(m_hDbhHelp, "SymGetSearchPath" );

	if ( pSC == NULL || pSFTA == NULL || pSGMB == NULL || pSGMI == NULL ||
	  pSGO == NULL || pSGSFA == NULL || pSI == NULL || pSSO == NULL ||
	  pSW == NULL || pUDSN == NULL || pSLM == NULL )
	{
	  FreeLibrary(m_hDbhHelp);
	  m_hDbhHelp = NULL;
	  pSC = NULL;
	  return FALSE;
	}

	// SymInitialize
	if (szSymPath != NULL)
	  m_szSymPath = _strdup(szSymPath);
	if (this->pSI(m_hProcess, m_szSymPath, FALSE) == FALSE)
	  this->m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);
	  
	DWORD symOptions = this->pSGO();  // SymGetOptions
	symOptions |= SYMOPT_LOAD_LINES;
	symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
	//symOptions |= SYMOPT_NO_PROMPTS;
	// SymSetOptions
	symOptions = this->pSSO(symOptions);

	char buf[StackWalker::STACKWALK_MAX_NAMELEN] = {0};
	if (this->pSGSP != NULL)
	{
	  if (this->pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN) == FALSE)
		this->m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
	}
	char szUserName[1024] = {0};
	DWORD dwSize = 1024;
	GetUserNameA(szUserName, &dwSize);
	this->m_parent->OnSymInit(buf, symOptions, szUserName);

	return TRUE;
  }

  StackWalker *m_parent;

  HMODULE m_hDbhHelp;
  HANDLE m_hProcess;
  LPSTR m_szSymPath;

/*typedef struct IMAGEHLP_MODULE64_V3 {
	DWORD	SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
	DWORD64  BaseOfImage;			// base load address of module
	DWORD	ImageSize;			  // virtual size of the loaded module
	DWORD	TimeDateStamp;		  // date/time stamp from pe header
	DWORD	CheckSum;			   // checksum from the pe header
	DWORD	NumSyms;				// number of symbols in the symbol table
	SYM_TYPE SymType;				// type of symbols loaded
	CHAR	 ModuleName[32];		 // module name
	CHAR	 ImageName[256];		 // image name
	// new elements: 07-Jun-2002
	CHAR	 LoadedImageName[256];   // symbol file name
	CHAR	 LoadedPdbName[256];	 // pdb file name
	DWORD	CVSig;				  // Signature of the CV record in the debug directories
	CHAR		 CVData[MAX_PATH * 3];   // Contents of the CV record
	DWORD	PdbSig;				 // Signature of PDB
	GUID	 PdbSig70;			   // Signature of PDB (VC 7 and up)
	DWORD	PdbAge;				 // DBI age of pdb
	BOOL	 PdbUnmatched;		   // loaded an unmatched pdb
	BOOL	 DbgUnmatched;		   // loaded an unmatched dbg
	BOOL	 LineNumbers;			// we have line number information
	BOOL	 GlobalSymbols;		  // we have internal symbol information
	BOOL	 TypeInfo;			   // we have type information
	// new elements: 17-Dec-2003
	BOOL	 SourceIndexed;		  // pdb supports source server
	BOOL	 Publics;				// contains public symbols
};
*/
typedef struct IMAGEHLP_MODULE64_V2 {
	DWORD	SizeOfStruct;		   // set to sizeof(IMAGEHLP_MODULE64)
	DWORD64  BaseOfImage;			// base load address of module
	DWORD	ImageSize;			  // virtual size of the loaded module
	DWORD	TimeDateStamp;		  // date/time stamp from pe header
	DWORD	CheckSum;			   // checksum from the pe header
	DWORD	NumSyms;				// number of symbols in the symbol table
	SYM_TYPE SymType;				// type of symbols loaded
	CHAR	 ModuleName[32];		 // module name
	CHAR	 ImageName[256];		 // image name
	CHAR	 LoadedImageName[256];   // symbol file name
};


  // SymCleanup()
  typedef BOOL (__stdcall *tSC)( IN HANDLE hProcess );
  tSC pSC;

  // SymFunctionTableAccess64()
  typedef PVOID (__stdcall *tSFTA)( HANDLE hProcess, DWORD64 AddrBase );
  tSFTA pSFTA;

  // SymGetLineFromAddr64()
  typedef BOOL (__stdcall *tSGLFA)( IN HANDLE hProcess, IN DWORD64 dwAddr,
	OUT PDWORD pdwDisplacement, OUT PIMAGEHLP_LINE64 Line );
  tSGLFA pSGLFA;

  // SymGetModuleBase64()
  typedef DWORD64 (__stdcall *tSGMB)( IN HANDLE hProcess, IN DWORD64 dwAddr );
  tSGMB pSGMB;

  // SymGetModuleInfo64()
  typedef BOOL (__stdcall *tSGMI)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V2 *ModuleInfo );
  tSGMI pSGMI;

//  // SymGetModuleInfo64()
//  typedef BOOL (__stdcall *tSGMI_V3)( IN HANDLE hProcess, IN DWORD64 dwAddr, OUT IMAGEHLP_MODULE64_V3 *ModuleInfo );
//  tSGMI_V3 pSGMI_V3;

  // SymGetOptions()
  typedef DWORD (__stdcall *tSGO)( VOID );
  tSGO pSGO;

  // SymGetSymFromAddr64()
  typedef BOOL (__stdcall *tSGSFA)( IN HANDLE hProcess, IN DWORD64 dwAddr,
	OUT PDWORD64 pdwDisplacement, OUT PIMAGEHLP_SYMBOL64 Symbol );
  tSGSFA pSGSFA;

  // SymInitialize()
  typedef BOOL (__stdcall *tSI)( IN HANDLE hProcess, IN PSTR UserSearchPath, IN BOOL fInvadeProcess );
  tSI pSI;

  // SymLoadModule64()
  typedef DWORD64 (__stdcall *tSLM)( IN HANDLE hProcess, IN HANDLE hFile,
	IN PSTR ImageName, IN PSTR ModuleName, IN DWORD64 BaseOfDll, IN DWORD SizeOfDll );
  tSLM pSLM;

  // SymSetOptions()
  typedef DWORD (__stdcall *tSSO)( IN DWORD SymOptions );
  tSSO pSSO;

  // StackWalk64()
  typedef BOOL (__stdcall *tSW)( 
	DWORD MachineType, 
	HANDLE hProcess,
	HANDLE hThread, 
	LPSTACKFRAME64 StackFrame, 
	PVOID ContextRecord,
	PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
	PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
	PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
	PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress );
  tSW pSW;

  // UnDecorateSymbolName()
  typedef DWORD (__stdcall WINAPI *tUDSN)( PCSTR DecoratedName, PSTR UnDecoratedName,
	DWORD UndecoratedLength, DWORD Flags );
  tUDSN pUDSN;

  typedef BOOL (__stdcall WINAPI *tSGSP)(HANDLE hProcess, PSTR SearchPath, DWORD SearchPathLength);
  tSGSP pSGSP;


private:
  // **************************************** ToolHelp32 ************************
  #define MAX_MODULE_NAME32 255
  #define TH32CS_SNAPMODULE   0x00000008
  #pragma pack( push, 8 )
  typedef struct tagMODULEENTRY32
  {
	  DWORD   dwSize;
	  DWORD   th32ModuleID;	   // This module
	  DWORD   th32ProcessID;	  // owning process
	  DWORD   GlblcntUsage;	   // Global usage count on the module
	  DWORD   ProccntUsage;	   // Module usage count in th32ProcessID's context
	  BYTE  * modBaseAddr;		// Base address of module in th32ProcessID's context
	  DWORD   modBaseSize;		// Size in bytes of module starting at modBaseAddr
	  HMODULE hModule;			// The hModule of this module in th32ProcessID's context
	  char	szModule[MAX_MODULE_NAME32 + 1];
	  char	szExePath[MAX_PATH];
  } MODULEENTRY32;
  typedef MODULEENTRY32 *  PMODULEENTRY32;
  typedef MODULEENTRY32 *  LPMODULEENTRY32;
  #pragma pack( pop )

  BOOL GetModuleListTH32(HANDLE hProcess, DWORD pid)
  {
	// CreateToolhelp32Snapshot()
	typedef HANDLE (__stdcall *tCT32S)(DWORD dwFlags, DWORD th32ProcessID);
	// Module32First()
	typedef BOOL (__stdcall *tM32F)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
	// Module32Next()
	typedef BOOL (__stdcall *tM32N)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);

	// try both dlls...
	const TCHAR *dllname[] = { _T("kernel32.dll"), _T("tlhelp32.dll") };
	HINSTANCE hToolhelp = NULL;
	tCT32S pCT32S = NULL;
	tM32F pM32F = NULL;
	tM32N pM32N = NULL;

	HANDLE hSnap;
	MODULEENTRY32 me;
	me.dwSize = sizeof(me);
	BOOL keepGoing;
	size_t i;

	for (i = 0; i<(sizeof(dllname) / sizeof(dllname[0])); i++ )
	{
	  hToolhelp = LoadLibrary( dllname[i] );
	  if (hToolhelp == NULL)
		continue;
	  pCT32S = (tCT32S) GetProcAddress(hToolhelp, "CreateToolhelp32Snapshot");
	  pM32F = (tM32F) GetProcAddress(hToolhelp, "Module32First");
	  pM32N = (tM32N) GetProcAddress(hToolhelp, "Module32Next");
	  if ( (pCT32S != NULL) && (pM32F != NULL) && (pM32N != NULL) )
		break; // found the functions!
	  FreeLibrary(hToolhelp);
	  hToolhelp = NULL;
	}

	if (hToolhelp == NULL)
	  return FALSE;

	hSnap = pCT32S( TH32CS_SNAPMODULE, pid );
	if (hSnap == (HANDLE) -1)
	  return FALSE;

	keepGoing = !!pM32F( hSnap, &me );
	int cnt = 0;
	while (keepGoing)
	{
	  this->LoadModule(hProcess, me.szExePath, me.szModule, (DWORD64) me.modBaseAddr, me.modBaseSize);
	  cnt++;
	  keepGoing = !!pM32N( hSnap, &me );
	}
	CloseHandle(hSnap);
	FreeLibrary(hToolhelp);
	if (cnt <= 0)
	  return FALSE;
	return TRUE;
  }  // GetModuleListTH32

  // **************************************** PSAPI ************************
  typedef struct _MODULEINFO {
	  LPVOID lpBaseOfDll;
	  DWORD SizeOfImage;
	  LPVOID EntryPoint;
  } MODULEINFO, *LPMODULEINFO;

  BOOL GetModuleListPSAPI(HANDLE hProcess)
  {
	// EnumProcessModules()
	typedef BOOL (__stdcall *tEPM)(HANDLE hProcess, HMODULE *lphModule, DWORD cb, LPDWORD lpcbNeeded );
	// GetModuleFileNameEx()
	typedef DWORD (__stdcall *tGMFNE)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize );
	// GetModuleBaseName()
	typedef DWORD (__stdcall *tGMBN)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename, DWORD nSize );
	// GetModuleInformation()
	typedef BOOL (__stdcall *tGMI)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO pmi, DWORD nSize );

	HINSTANCE hPsapi;
	tEPM pEPM;
	tGMFNE pGMFNE;
	tGMBN pGMBN;
	tGMI pGMI;

	DWORD i;
	//ModuleEntry e;
	DWORD cbNeeded;
	MODULEINFO mi;
	HMODULE *hMods = 0;
	char *tt = NULL;
	char *tt2 = NULL;
	const SIZE_T TTBUFLEN = 8096;
	int cnt = 0;

	hPsapi = LoadLibrary( _T("psapi.dll") );
	if (hPsapi == NULL)
	  return FALSE;

	pEPM = (tEPM) GetProcAddress( hPsapi, "EnumProcessModules" );
	pGMFNE = (tGMFNE) GetProcAddress( hPsapi, "GetModuleFileNameExA" );
	pGMBN = (tGMFNE) GetProcAddress( hPsapi, "GetModuleBaseNameA" );
	pGMI = (tGMI) GetProcAddress( hPsapi, "GetModuleInformation" );
	if ( (pEPM == NULL) || (pGMFNE == NULL) || (pGMBN == NULL) || (pGMI == NULL) )
	{
	  // we couldn�t find all functions
	  FreeLibrary(hPsapi);
	  return FALSE;
	}

	hMods = (HMODULE*) malloc(sizeof(HMODULE) * (TTBUFLEN / sizeof HMODULE));
	tt = (char*) malloc(sizeof(char) * TTBUFLEN);
	tt2 = (char*) malloc(sizeof(char) * TTBUFLEN);
	if ( (hMods == NULL) || (tt == NULL) || (tt2 == NULL) )
	  goto cleanup;

	if ( ! pEPM( hProcess, hMods, TTBUFLEN, &cbNeeded ) )
	{
	  //_ftprintf(fLogFile, _T("%lu: EPM failed, GetLastError = %lu\n"), g_dwShowCount, gle );
	  goto cleanup;
	}

	if ( cbNeeded > TTBUFLEN )
	{
	  //_ftprintf(fLogFile, _T("%lu: More than %lu module handles. Huh?\n"), g_dwShowCount, lenof( hMods ) );
	  goto cleanup;
	}

	for ( i = 0; i < cbNeeded / sizeof hMods[0]; i++ )
	{
	  // base address, size
	  pGMI(hProcess, hMods[i], &mi, sizeof mi );
	  // image file name
	  tt[0] = 0;
	  pGMFNE(hProcess, hMods[i], tt, TTBUFLEN );
	  // module name
	  tt2[0] = 0;
	  pGMBN(hProcess, hMods[i], tt2, TTBUFLEN );

	  DWORD dwRes = this->LoadModule(hProcess, tt, tt2, (DWORD64) mi.lpBaseOfDll, mi.SizeOfImage);
	  if (dwRes != ERROR_SUCCESS)
		this->m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
	  cnt++;
	}

  cleanup:
	if (hPsapi != NULL) FreeLibrary(hPsapi);
	if (tt2 != NULL) free(tt2);
	if (tt != NULL) free(tt);
	if (hMods != NULL) free(hMods);

	return cnt != 0;
  }  // GetModuleListPSAPI

  DWORD LoadModule(HANDLE hProcess, LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size)
  {
	CHAR *szImg = _strdup(img);
	CHAR *szMod = _strdup(mod);
	DWORD result = ERROR_SUCCESS;
	if ( (szImg == NULL) || (szMod == NULL) )
	  result = ERROR_NOT_ENOUGH_MEMORY;
	else
	{
	  if (pSLM(hProcess, 0, szImg, szMod, baseAddr, size) == 0)
		result = GetLastError();
	}
	ULONGLONG fileVersion = 0;
	if ( (m_parent != NULL) && (szImg != NULL) )
	{
	  // try to retrive the file-version:
	  if ( (this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0)
	  {
		VS_FIXEDFILEINFO *fInfo = NULL;
		DWORD dwHandle;
		DWORD dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
		if (dwSize > 0)
		{
		  LPVOID vData = malloc(dwSize);
		  if (vData != NULL)
		  {
			if (GetFileVersionInfoA(szImg, dwHandle, dwSize, vData) != 0)
			{
			  UINT len;
			  TCHAR szSubBlock[] = _T("\\");
			  if (VerQueryValue(vData, szSubBlock, (LPVOID*) &fInfo, &len) == 0)
				fInfo = NULL;
			  else
			  {
				fileVersion = ((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
			  }
			}
			free(vData);
		  }
		}
	  }

	  // Retrive some additional-infos about the module
	  IMAGEHLP_MODULE64_V2 Module;
	  const char *szSymType = "-unknown-";
	  if (this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
	  {
		switch(Module.SymType)
		{
		  case SymNone:
			szSymType = "-nosymbols-";
			break;
		  case SymCoff:
			szSymType = "COFF";
			break;
		  case SymCv:
			szSymType = "CV";
			break;
		  case SymPdb:
			szSymType = "PDB";
			break;
		  case SymExport:
			szSymType = "-exported-";
			break;
		  case SymDeferred:
			szSymType = "-deferred-";
			break;
		  case SymSym:
			szSymType = "SYM";
			break;
		  case 8: //SymVirtual:
			szSymType = "Virtual";
			break;
		  case 9: // SymDia:
			szSymType = "DIA";
			break;
		}
	  }
	  this->m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, Module.LoadedImageName, fileVersion);
	}
	if (szImg != NULL) free(szImg);
	if (szMod != NULL) free(szMod);
	return result;
  }
public:
  BOOL LoadModules(HANDLE hProcess, DWORD dwProcessId)
  {
	// first try toolhelp32
	if (GetModuleListTH32(hProcess, dwProcessId))
	  return true;
	// then try psapi
	return GetModuleListPSAPI(hProcess);
  }


  BOOL GetModuleInfo(HANDLE hProcess, DWORD64 baseAddr, IMAGEHLP_MODULE64_V2 *pModuleInfo)
  {
	if(this->pSGMI == NULL)
	{
	  SetLastError(ERROR_DLL_INIT_FAILED);
	  return FALSE;
	}
	// First try to use the larger ModuleInfo-Structure
//	memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
//	pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
//	if (this->pSGMI_V3 != NULL)
//	{
//	  if (this->pSGMI_V3(hProcess, baseAddr, pModuleInfo) != FALSE)
//		return TRUE;
//	  // check if the parameter was wrong (size is bad...)
//	  if (GetLastError() != ERROR_INVALID_PARAMETER)
//		return FALSE;
//	}
	// could not retrive the bigger structure, try with the smaller one (as defined in VC7.1)...
	pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
	void *pData = malloc(4096); // reserve enough memory, so the bug in v6.3.5.1 does not lead to memory-overwrites...
	if (pData == NULL)
	{
	  SetLastError(ERROR_NOT_ENOUGH_MEMORY);
	  return FALSE;
	}
	memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V2));
	if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V2*) pData) != FALSE)
	{
	  // only copy as much memory as is reserved...
	  memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V2));
	  pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
	  free(pData);
	  return TRUE;
	}
	free(pData);
	SetLastError(ERROR_DLL_INIT_FAILED);
	return FALSE;
  }
};

// #############################################################
StackWalker::StackWalker(DWORD dwProcessId, HANDLE hProcess)
{
  this->m_options = OptionsAll;
  this->m_modulesLoaded = FALSE;
  this->m_hProcess = hProcess;
  this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
  this->m_dwProcessId = dwProcessId;
  this->m_szSymPath = NULL;
}
StackWalker::StackWalker(int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
{
  this->m_options = options;
  this->m_modulesLoaded = FALSE;
  this->m_hProcess = hProcess;
  this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
  this->m_dwProcessId = dwProcessId;
  if (szSymPath != NULL)
  {
	this->m_szSymPath = _strdup(szSymPath);
	this->m_options |= SymBuildPath;
  }
  else
	this->m_szSymPath = NULL;
}

StackWalker::~StackWalker()
{
  if (m_szSymPath != NULL)
	free(m_szSymPath);
  m_szSymPath = NULL;
  if (this->m_sw != NULL)
	delete this->m_sw;
  this->m_sw = NULL;
}

BOOL StackWalker::LoadModules()
{
  if (this->m_sw == NULL)
  {
	SetLastError(ERROR_DLL_INIT_FAILED);
	return FALSE;
  }
  if (m_modulesLoaded != FALSE)
	return TRUE;

  // Build the sym-path:
  char *szSymPath = NULL;
  if ( (this->m_options & SymBuildPath) != 0)
  {
	const size_t nSymPathLen = 4096;
	szSymPath = (char*) malloc(nSymPathLen);
	if (szSymPath == NULL)
	{
	  SetLastError(ERROR_NOT_ENOUGH_MEMORY);
	  return FALSE;
	}
	szSymPath[0] = 0;
	// Now first add the (optional) provided sympath:
	if (this->m_szSymPath != NULL)
	{
	  strcat_s(szSymPath, nSymPathLen, this->m_szSymPath);
	  strcat_s(szSymPath, nSymPathLen, ";");
	}

	strcat_s(szSymPath, nSymPathLen, ".;");

	const size_t nTempLen = 1024;
	char szTemp[nTempLen];
	// Now add the current directory:
	if (GetCurrentDirectoryA(nTempLen, szTemp) > 0)
	{
	  szTemp[nTempLen-1] = 0;
	  strcat_s(szSymPath, nSymPathLen, szTemp);
	  strcat_s(szSymPath, nSymPathLen, ";");
	}

	// Now add the path for the main-module:
	if (GetModuleFileNameA(NULL, szTemp, nTempLen) > 0)
	{
	  szTemp[nTempLen-1] = 0;
	  for (char *p = (szTemp+strlen(szTemp)-1); p >= szTemp; --p)
	  {
		// locate the rightmost path separator
		if ( (*p == '\\') || (*p == '/') || (*p == ':') )
		{
		  *p = 0;
		  break;
		}
	  }  // for (search for path separator...)
	  if (strlen(szTemp) > 0)
	  {
		strcat_s(szSymPath, nSymPathLen, szTemp);
		strcat_s(szSymPath, nSymPathLen, ";");
	  }
	}
	if (GetEnvironmentVariableA("_NT_SYMBOL_PATH", szTemp, nTempLen) > 0)
	{
	  szTemp[nTempLen-1] = 0;
	  strcat_s(szSymPath, nSymPathLen, szTemp);
	  strcat_s(szSymPath, nSymPathLen, ";");
	}
	if (GetEnvironmentVariableA("_NT_ALTERNATE_SYMBOL_PATH", szTemp, nTempLen) > 0)
	{
	  szTemp[nTempLen-1] = 0;
	  strcat_s(szSymPath, nSymPathLen, szTemp);
	  strcat_s(szSymPath, nSymPathLen, ";");
	}
	if (GetEnvironmentVariableA("SYSTEMROOT", szTemp, nTempLen) > 0)
	{
	  szTemp[nTempLen-1] = 0;
	  strcat_s(szSymPath, nSymPathLen, szTemp);
	  strcat_s(szSymPath, nSymPathLen, ";");
	  // also add the "system32"-directory:
	  strcat_s(szTemp, nTempLen, "\\system32");
	  strcat_s(szSymPath, nSymPathLen, szTemp);
	  strcat_s(szSymPath, nSymPathLen, ";");
	}

	if ( (this->m_options & SymBuildPath) != 0)
	{
	  if (GetEnvironmentVariableA("SYSTEMDRIVE", szTemp, nTempLen) > 0)
	  {
		szTemp[nTempLen-1] = 0;
		strcat_s(szSymPath, nSymPathLen, "SRV*");
		strcat_s(szSymPath, nSymPathLen, szTemp);
		strcat_s(szSymPath, nSymPathLen, "\\websymbols");
		strcat_s(szSymPath, nSymPathLen, "*http://msdl.microsoft.com/download/symbols;");
	  }
	  else
		strcat_s(szSymPath, nSymPathLen, "SRV*c:\\websymbols*http://msdl.microsoft.com/download/symbols;");
	}
  }

  // First Init the whole stuff...
  BOOL bRet = this->m_sw->Init(szSymPath);
  if (szSymPath != NULL) free(szSymPath); szSymPath = NULL;
  if (bRet == FALSE)
  {
	this->OnDbgHelpErr("Error while initializing dbghelp.dll", 0, 0);
	SetLastError(ERROR_DLL_INIT_FAILED);
	return FALSE;
  }

  bRet = this->m_sw->LoadModules(this->m_hProcess, this->m_dwProcessId);
  if (bRet != FALSE)
	m_modulesLoaded = TRUE;
  return bRet;
}


// The following is used to pass the "userData"-Pointer to the user-provided readMemoryFunction
// This has to be done due to a problem with the "hProcess"-parameter in x64...
// Because this class is in no case multi-threading-enabled (because of the limitations 
// of dbghelp.dll) it is "safe" to use a static-variable
static StackWalker::PReadProcessMemoryRoutine s_readMemoryFunction = NULL;
static LPVOID s_readMemoryFunction_UserData = NULL;

BOOL StackWalker::ShowCallstack(HANDLE hThread, const CONTEXT *context, PReadProcessMemoryRoutine readMemoryFunction, LPVOID pUserData)
{
  CONTEXT c;;
  CallstackEntry csEntry;
  IMAGEHLP_SYMBOL64 *pSym = NULL;
  StackWalkerInternal::IMAGEHLP_MODULE64_V2 Module;
  IMAGEHLP_LINE64 Line;
  int frameNum;

  if (m_modulesLoaded == FALSE)
	this->LoadModules();  // ignore the result...

  if (this->m_sw->m_hDbhHelp == NULL)
  {
	SetLastError(ERROR_DLL_INIT_FAILED);
	return FALSE;
  }

  s_readMemoryFunction = readMemoryFunction;
  s_readMemoryFunction_UserData = pUserData;

  if (context == NULL)
  {
	// If no context is provided, capture the context
	if (hThread == GetCurrentThread())
	{
	  GET_CURRENT_CONTEXT(c, USED_CONTEXT_FLAGS);
	}
	else
	{
	  SuspendThread(hThread);
	  memset(&c, 0, sizeof(CONTEXT));
	  c.ContextFlags = USED_CONTEXT_FLAGS;
	  if (GetThreadContext(hThread, &c) == FALSE)
	  {
		ResumeThread(hThread);
		return FALSE;
	  }
	}
  }
  else
	c = *context;

  // init STACKFRAME for first call
  STACKFRAME64 s; // in/out stackframe
  memset(&s, 0, sizeof(s));
  DWORD imageType;
#ifdef _M_IX86
  // normally, call ImageNtHeader() and use machine info from PE header
  imageType = IMAGE_FILE_MACHINE_I386;
  s.AddrPC.Offset = c.Eip;
  s.AddrPC.Mode = AddrModeFlat;
  s.AddrFrame.Offset = c.Ebp;
  s.AddrFrame.Mode = AddrModeFlat;
  s.AddrStack.Offset = c.Esp;
  s.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
  imageType = IMAGE_FILE_MACHINE_AMD64;
  s.AddrPC.Offset = c.Rip;
  s.AddrPC.Mode = AddrModeFlat;
  s.AddrFrame.Offset = c.Rsp;
  s.AddrFrame.Mode = AddrModeFlat;
  s.AddrStack.Offset = c.Rsp;
  s.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
  imageType = IMAGE_FILE_MACHINE_IA64;
  s.AddrPC.Offset = c.StIIP;
  s.AddrPC.Mode = AddrModeFlat;
  s.AddrFrame.Offset = c.IntSp;
  s.AddrFrame.Mode = AddrModeFlat;
  s.AddrBStore.Offset = c.RsBSP;
  s.AddrBStore.Mode = AddrModeFlat;
  s.AddrStack.Offset = c.IntSp;
  s.AddrStack.Mode = AddrModeFlat;
#else
#error "Platform not supported!"
#endif

  pSym = (IMAGEHLP_SYMBOL64 *) malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
  if (!pSym) goto cleanup;  // not enough memory...
  memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
  pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
  pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;

  memset(&Line, 0, sizeof(Line));
  Line.SizeOfStruct = sizeof(Line);

  memset(&Module, 0, sizeof(Module));
  Module.SizeOfStruct = sizeof(Module);

  for (frameNum = 0; ; ++frameNum )
  {
	// get next stack frame (StackWalk64(), SymFunctionTableAccess64(), SymGetModuleBase64())
	// if this returns ERROR_INVALID_ADDRESS (487) or ERROR_NOACCESS (998), you can
	// assume that either you are done, or that the stack is so hosed that the next
	// deeper frame could not be found.
	// CONTEXT need not to be suplied if imageTyp is IMAGE_FILE_MACHINE_I386!
	if ( ! this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem, this->m_sw->pSFTA, this->m_sw->pSGMB, NULL) )
	{
	  this->OnDbgHelpErr("StackWalk64", GetLastError(), s.AddrPC.Offset);
	  break;
	}

	csEntry.offset = s.AddrPC.Offset;
	csEntry.name[0] = 0;
	csEntry.undName[0] = 0;
	csEntry.undFullName[0] = 0;
	csEntry.offsetFromSmybol = 0;
	csEntry.offsetFromLine = 0;
	csEntry.lineFileName[0] = 0;
	csEntry.lineNumber = 0;
	csEntry.loadedImageName[0] = 0;
	csEntry.moduleName[0] = 0;
	if (s.AddrPC.Offset == s.AddrReturn.Offset)
	{
	  this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
	  break;
	}
	if (s.AddrPC.Offset != 0)
	{
	  // we seem to have a valid PC
	  // show procedure info (SymGetSymFromAddr64())
	  if (this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol), pSym) != FALSE)
	  {
		// TODO: Mache dies sicher...!
		strcpy_s(csEntry.name, pSym->Name);
		// UnDecorateSymbolName()
		this->m_sw->pUDSN( pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY );
		this->m_sw->pUDSN( pSym->Name, csEntry.undFullName, STACKWALK_MAX_NAMELEN, UNDNAME_COMPLETE );
	  }
	  else
	  {
		this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), s.AddrPC.Offset);
	  }

	  // show line number info, NT5.0-method (SymGetLineFromAddr64())
	  if (this->m_sw->pSGLFA != NULL )
	  { // yes, we have SymGetLineFromAddr64()
		if (this->m_sw->pSGLFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine), &Line) != FALSE)
		{
		  csEntry.lineNumber = Line.LineNumber;
		  // TODO: Mache dies sicher...!
		  strcpy_s(csEntry.lineFileName, Line.FileName);
		}
		else
		{
		  this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
		}
	  } // yes, we have SymGetLineFromAddr64()

	  // show module info (SymGetModuleInfo64())
	  if (this->m_sw->GetModuleInfo(this->m_hProcess, s.AddrPC.Offset, &Module ) != FALSE)
	  { // got module info OK
		switch ( Module.SymType )
		{
		case SymNone:
		  csEntry.symTypeString = "-nosymbols-";
		  break;
		case SymCoff:
		  csEntry.symTypeString = "COFF";
		  break;
		case SymCv:
		  csEntry.symTypeString = "CV";
		  break;
		case SymPdb:
		  csEntry.symTypeString = "PDB";
		  break;
		case SymExport:
		  csEntry.symTypeString = "-exported-";
		  break;
		case SymDeferred:
		  csEntry.symTypeString = "-deferred-";
		  break;
		case SymSym:
		  csEntry.symTypeString = "SYM";
		  break;
#if API_VERSION_NUMBER >= 9
		case SymDia:
		  csEntry.symTypeString = "DIA";
		  break;
#endif
		case 8: //SymVirtual:
		  csEntry.symTypeString = "Virtual";
		  break;
		default:
		  //_snprintf( ty, sizeof ty, "symtype=%ld", (long) Module.SymType );
		  csEntry.symTypeString = NULL;
		  break;
		}

		// TODO: Mache dies sicher...!
		strcpy_s(csEntry.moduleName, Module.ModuleName);
		csEntry.baseOfImage = Module.BaseOfImage;
		strcpy_s(csEntry.loadedImageName, Module.LoadedImageName);
	  } // got module info OK
	  else
	  {
		this->OnDbgHelpErr("SymGetModuleInfo64", GetLastError(), s.AddrPC.Offset);
	  }
	} // we seem to have a valid PC

	CallstackEntryType et = nextEntry;
	if (frameNum == 0)
	  et = firstEntry;
	this->OnCallstackEntry(et, csEntry);
	
	if (s.AddrReturn.Offset == 0)
	{
	  this->OnCallstackEntry(lastEntry, csEntry);
	  SetLastError(ERROR_SUCCESS);
	  break;
	}
  } // for ( frameNum )

  cleanup:
	if (pSym) free( pSym );

  if (context == NULL)
	ResumeThread(hThread);

  return TRUE;
}

BOOL __stdcall StackWalker::myReadProcMem(
	HANDLE	  hProcess,
	DWORD64	 qwBaseAddress,
	PVOID	   lpBuffer,
	DWORD	   nSize,
	LPDWORD	 lpNumberOfBytesRead
	)
{
  if (s_readMemoryFunction == NULL)
  {
	SIZE_T st;
	BOOL bRet = ReadProcessMemory(hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, &st);
	*lpNumberOfBytesRead = (DWORD) st;
	//printf("ReadMemory: hProcess: %p, baseAddr: %p, buffer: %p, size: %d, read: %d, result: %d\n", hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, (DWORD) st, (DWORD) bRet);
	return bRet;
  }
  else
  {
	return s_readMemoryFunction(hProcess, qwBaseAddress, lpBuffer, nSize, lpNumberOfBytesRead, s_readMemoryFunction_UserData);
  }
}

void StackWalker::OnLoadModule(LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size, DWORD result, LPCSTR symType, LPCSTR pdbName, ULONGLONG fileVersion)
{
  CHAR buffer[STACKWALK_MAX_NAMELEN];
  if (fileVersion == 0)
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName);
  else
  {
	DWORD v4 = (DWORD) fileVersion & 0xFFFF;
	DWORD v3 = (DWORD) (fileVersion>>16) & 0xFFFF;
	DWORD v2 = (DWORD) (fileVersion>>32) & 0xFFFF;
	DWORD v1 = (DWORD) (fileVersion>>48) & 0xFFFF;
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d\n", img, mod, (LPVOID) baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
  }
  OnOutput(buffer);
}

void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry &entry)
{
  CHAR buffer[STACKWALK_MAX_NAMELEN];
  if ( (eType != lastEntry) && (entry.offset != 0) )
  {
	if (entry.name[0] == 0)
	  strcpy_s(entry.name, "(function-name not available)");
	if (entry.undName[0] != 0)
	  strcpy_s(entry.name, entry.undName);
	if (entry.undFullName[0] != 0)
	  strcpy_s(entry.name, entry.undFullName);
	if (entry.lineFileName[0] == 0)
	{
	  strcpy_s(entry.lineFileName, "(filename not available)");
	  if (entry.moduleName[0] == 0)
		strcpy_s(entry.moduleName, "(module-name not available)");
	  _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%p (%s): %s: %s\n", (LPVOID) entry.offset, entry.moduleName, entry.lineFileName, entry.name);
	}
	else
	  _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "%s (%d): %s\n", entry.lineFileName, entry.lineNumber, entry.name);
	OnOutput(buffer);
  }
}

void StackWalker::OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr)
{
  CHAR buffer[STACKWALK_MAX_NAMELEN];
  _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "ERROR: %s, GetLastError: %d (Address: %p)\n", szFuncName, gle, (LPVOID) addr);
  OnOutput(buffer);
}

void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
{
  CHAR buffer[STACKWALK_MAX_NAMELEN];
  _snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'\n", szSearchPath, symOptions, szUserName);
  OnOutput(buffer);
  // Also display the OS-version
#if _MSC_VER <= 1200
  OSVERSIONINFOA ver;
  ZeroMemory(&ver, sizeof(OSVERSIONINFOA));
  ver.dwOSVersionInfoSize = sizeof(ver);
  if (GetVersionExA(&ver) != FALSE)
  {
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s)\n", 
	  ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
	  ver.szCSDVersion);
	OnOutput(buffer);
  }
#else
  OSVERSIONINFOEXA ver;
  ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
  ver.dwOSVersionInfoSize = sizeof(ver);
  if (GetVersionExA( (OSVERSIONINFOA*) &ver) != FALSE)
  {
	_snprintf_s(buffer, STACKWALK_MAX_NAMELEN, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n", 
	  ver.dwMajorVersion, ver.dwMinorVersion, ver.dwBuildNumber,
	  ver.szCSDVersion, ver.wSuiteMask, ver.wProductType);
	OnOutput(buffer);
  }
#endif
}

void StackWalker::OnOutput(LPCSTR buffer)
{
  OutputDebugStringA(buffer);
}
